A Rope poll of 2,000 American adults showed that 1,440 thought that chemical dumps are among the most serious environmental problems. Then answer the following problems (make sure you provide the expressions where necessary):

i. Provide a single value estimate of the true proportion of Americans who consider chemical dumps to be among the most serious environmental problems.

ii. Compute the standard error of your estimate in Part i.

iii. Now, estimate with a 98% confidence interval the true proportion of Americans who consider chemical dumps to be among the most serious environmental problems.